CVE-2026-25673
March 03, 2026
An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29.
"URLField.to_python()" in Django calls "urllib.parse.urlsplit()", which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters.
Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.
Django would like to thank Seokchan Yoon for reporting this issue.
Affected Packages
https://github.com/django/django.git (GITHUB):
Affected version(s) >=5.2a1 <5.2.12Fix Suggestion:
Update to version 5.2.12https://github.com/django/django.git (GITHUB):
Affected version(s) >=6.0a1 <6.0.3Fix Suggestion:
Update to version 6.0.3https://github.com/django/django.git (GITHUB):
Affected version(s) >=4.2a1 <4.2.29Fix Suggestion:
Update to version 4.2.29django (PYTHON):
Affected version(s) >=5.2 <5.2.12Fix Suggestion:
Update to version 5.2.12django (PYTHON):
Affected version(s) >=5.2 <5.2.12Fix Suggestion:
Update to version 5.2.12django (PYTHON):
Affected version(s) >=6.0 <6.0.3Fix Suggestion:
Update to version 6.0.3django (PYTHON):
Affected version(s) >=4.2 <4.2.29Fix Suggestion:
Update to version 4.2.29django (PYTHON):
Affected version(s) >=6.0 <6.0.3Fix Suggestion:
Update to version 6.0.3django (PYTHON):
Affected version(s) >=4.2 <4.2.29Fix Suggestion:
Update to version 4.2.29Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
8.7
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
HIGH
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
7.5
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH
Weakness Type (CWE)
EPSS
Base Score:
0.16
